Sometimes it can be useful to divide Parkour into two aspects. There is the exploration part, and the achieving part. When you are exploring you care mostly about new experiences because that's the only thing that helps you learn. When you are achieving you care mostly about fundamental abilities, because that's the part that helps you get better at other things.
Practising flips and 'non-efficient movement' can be useful for many people as part of an exploration of what is possible through practicing movement. They are a way of giving yourself an opportunity for limitless creativity, letting you concentrate on the 'new' rather than on the 'necessary'. There are other ways of approaching this, but this type of training is essential in ensuring your training as a whole is effective.
However, the price for removing limits is that you don't get practice maintaining the focus necessary for working with situations that have limits. Every real situation has limits of some kind, and so this type of training is also an essential part for your training as a whole to be effective.
Practically speaking, you're going to need to spend time being creative and also spend time being focused. You get to choose how much of each
